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Johnny Dee was an editorial assistant working at the Daily Clarion. He gained his powers from a "magic formula" of Eastern origin. He became a superhero for unknown reasons. Eventually, Captain Miracle teamed up with Tod Allen / Miracle Kid (who had similar powers). Captain Miracle later turned up in Zenith Phase Three and was under the control of Lliogor.
Johnny Dee could transform into the superhero Captain Miracle. He did so when he says "El Karim" (similar to Marvelman's "Kimota"). Captain Miracle has super strength, invulnerability and flight.
Relation to Marvelman
Captain Miracle was created by Marvelman creator Mike Anglo. Captain Miracle's adventures were actually slightly altered and re-lettered Marvelman comics. As such, Captain Miracle is based on Marvelman and Miracle Jnr. is based on Young Marvelman.